Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c827521b0f516e…

MALICIOUS

PDF

84.1 KB Created: 2021-08-18 03:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 823cbfe73c3d0db12d685c99560843a1 SHA-1: 463456dad878209bf811b5662309be98c725de0c SHA-256: 86c827521b0f516e9180bade23f2455b08eca2c83dbe27006943b0b731e8e23d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing or malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jaziwanuzatujulegubepopi.pdf In PDF document text
    • https://webmenuplus.com/images/file/lofotibej.pdfIn PDF document text
    • http://medi-sen.com/files/files/nuwukudupe.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/eed3647abf104609dc803d573d565d31/32411766974.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160971d6c2c4af---12982827780.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/a30f2b84efd4e95db6919337e9d19338/kexapi.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/20663735455.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b8f6cd43---83748779311.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d15f74b79f---mezudogexinafesisomo.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/nadikopalu.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/42078385196.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608276b83692a---83235716664.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ca69b9bd2---wonutuvow.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/nenixumelu.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/21285036033.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/28475606903.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44347245e3---lonomiwuwavipegavo.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/5162b44132370ab54a09891a32c12c9b/18733624638.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6dd1e4b4b6015c7fc8149c1410ac6fe4/35945225348.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/188362221c9a1264ea2b0bfea631ec43/74799743237.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/tifomer.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210815025217.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/53891906971.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/60320170713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=null%27s+brawl+%D1%81+%D0%B2%D0%BE%D0%BB%D1%8C%D1%82%D0%BE%D0%BC+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%BD%D0%B0+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 11420 bytes
SHA-256: b9bec6d7bf1bb35b3deef9ee00827ebae322c74e559975579f8465076da88e93
font_01_sfnt_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 21864 bytes
SHA-256: 44898d50dd3f900737943acef39ffb238fe0a3beaac55f07f43d54acea6a63bc
font_02_sfnt_off00012763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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